1. optic axis | |
In a doubly refracting crystal, the line in the direction of which no double refraction occurs
"a crystal may have either one or two optic axes";
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2. optic axis [ Synonyms: principal axis] | |
A line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
"in a normal eye the optic axis is the direction in which objects are seen most distinctly";
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